150 FISH CULTUEE 



of tie Clark make or those of similar pattern. 

 Of course if it becomes plainly evident that eggs 

 in the troughs of the Pennsylvania pattern are 

 certain to smother if the mud which surrounds 

 them is not cleaned, then the risk of clearing 

 must be taken if there is the slightest chance 

 that even a part of them may be saved. After 

 eyeing, eggs can be handled freely and cleansed 

 at will without danger. 



One very important thing is to avoid any jar- 

 ring of the troughs and trays during the entire 

 period of incubation. It is very disastrous to 

 green and young eggs, and productive of mon- 

 strosities at the eyeing period. Double fishes, 

 that is, two fishes to one yolk, are not produced 

 in this manner, but through more than one atom 

 of milt having entered the micropyle when the 

 egg was fertilised. 



Feathering. Frequent mention has been 

 made of feathering eggs. The operation con- 

 sists simply in taking a feather, preferably a 

 turkey feather, and gently waving it along the 

 eggs or the fry, or among or over them. Feath- 

 ering only begins after the eyes show, and ought 

 to be repeated frequently thereafter. It is done 



